#header{text-align:center;margin-bottom:20px}header h1{color:#111;font-size:1.6rem;font-weight:700;margin-top:12px}#nav{flex:1;max-width:720px;width:100%;margin:0 auto;align-items:center}#nav h2{color:#111;font-size:1.05rem;text-align:center;margin-bottom:18px;font-weight:600}ul{list-style:none;display:flex;flex-direction:column;gap:20px}li{width:100%}a{display:flex;align-items:center;justify-content:space-between;text-decoration:none;background:#fff;color:#111827;padding:16px 18px;border-radius:10px;font-size:1.05rem;font-weight:600;box-shadow:0 6px 18px #1018280a;transition:transform .12s ease,background .12s ease;position:relative;overflow:hidden}a:after{content:"→";font-size:1.2rem;transition:transform .12s 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#1018280f}input[type=text]::placeholder,input[type=email]::placeholder,textarea::placeholder{color:#999}textarea{min-height:120px;resize:vertical;font-family:inherit}button[type=submit]{width:100%;padding:12px;background:#2563eb;color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .12s ease,opacity .12s ease;box-shadow:0 8px 18px #2563eb14;position:relative;overflow:hidden}button[type=submit]:hover{transform:translateY(-2px)}#status{margin-top:14px;margin-bottom:18px;text-align:center;font-size:14px;font-weight:600;padding:10px 14px;border-radius:8px;background:#fff;box-shadow:0 6px 18px #1018280a;position:relative;z-index:1;color:#333}#status:empty{display:none}#homenav{width:100%;max-width:500px;margin-bottom:18px;position:relative;z-index:1}#homenav button{background:#10b981;color:#fff;width:100%;padding:12px;font-size:15px;font-weight:600;border:none;border-radius:10px;cursor:pointer;transition:transform .12s ease,opacity .12s 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button:hover{background:linear-gradient(145deg,#3ed680,#2ec96d)}#footer{text-align:center;margin-top:20px;padding-top:12px;border-top:1px solid rgba(16,24,40,.04)}#footer p{color:#22252999;font-size:12px}.key-hint{position:absolute;top:5px;right:5px;font-size:10px;color:#ffffff4d}@media(max-width:480px){.calculator{padding:16px}button{padding:14px;font-size:16px}#display{font-size:24px;padding:16px}.function{font-size:14px}}